METHOD AND APPARATUS FOR BLOW MOLDING

摘要

PROBLEM TO BE SOLVED: To solve the following problems: because a pair of lateral cylinders is provided in addition to a vertical cylinder in order to drive an expander panel inserted into a parison, the structure of a blow molding machine is made complex, and it is impossible to reduce the weight of a blow-molded article by obtaining the blow-molded article having a uniform wall thickness. SOLUTION: An inner mold 5 having a shape smaller than those of molds 4a and 4b is installed to be able to take the center position and shelter position of the opened molds 4a and 4b relatively. The parison can be extruded to cover the inner mold 5, and the parison extruded to cover the inner mold 5 is divided into two parts when the molds 4a and 4b are closed. The divided parison 1 is expanded to give the shape of the blow-molded article 1f. COPYRIGHT: (C)2006,JPO&NCIPI